WO2021132999A1 - Sensing device - Google Patents

Abstract

Provided in one embodiment is a sensing device comprising a stator including a stator tooth, and a rotor including a magnet, wherein the stator tooth includes a first stator tooth and a second stator tooth arranged in the first stator tooth, the first stator tooth includes a plurality of first teeth, second stator tooth includes a plurality of second teeth, and the first teeth overlap with the second teeth in the radial direction from the center of the stator, the sensing device further comprising a first sensor and a collector arranged between the first stator tooth and the second stator tooth in the radial direction, wherein the collector includes a first collector and a second collector arranged in the first collector, the first sensor is arranged between the ring-shaped first collector and the ring-shaped second collector in the radial direction, the first collector and the second collector respectively include a body arranged to face the first sensor, and an extending part that extends from the body, the extending part includes a protrusion part protruding from one side edge of the extending part in the axial direction, and the protrusion part includes areas that differ in width in the circumferential direction.

Description

sensing device

The embodiment relates to a sensing device.

The Power Steering System (hereinafter referred to as 'EPS') drives a motor from the Electronic Control Unit according to driving conditions to ensure turning stability and provide quick recovery, thereby making the driver safer. make driving possible.

The EPS includes a sensor assembly that measures a torque of a steering shaft, a steering angle, and the like, in order to provide an appropriate torque. The sensor assembly may include a torque sensor for measuring a torque applied to the steering shaft and an index sensor for measuring angular acceleration of the steering shaft. In addition, the steering shaft may include an input shaft connected to the handle, an output shaft connected to a power transmission configuration on the wheel side, and a torsion bar connecting the input shaft and the output shaft.

The torque sensor measures the torque applied to the steering shaft by measuring the degree of torsion of the torsion bar. And the index sensor detects the rotation of the output shaft, and measures the angular acceleration of the steering shaft. In the sensor assembly, the torque sensor and the index sensor may be disposed together and configured integrally.

The torque sensor may include a housing, a rotor, a stator including a stator tooth, and a collector to measure the torque.

In this case, the torque sensor may be provided as a magnetic type structure, in which the collector is disposed outside the stator tooth.

However, when an external magnetic field is generated, since the collector serves as a passage for the external magnetic field in the structure, there is a problem in that the magnetic flux value of the Hall IC is affected. Accordingly, a change occurs in the output value of the torque sensor, so that the degree of torsion of the torsion bar cannot be accurately measured.

In particular, since the torque sensor may be affected by an external magnetic field more often as the number of electric vehicles increases, a torque sensor that is not affected by an external magnetic field is being requested.

In addition, two collectors disposed to face each other in the radial direction may be fixed to the housing. At this time. During the fusion process, the gap between the outer collector and the inner collector changes or the height of the collector changes, which may cause fatal problems in sensor performance.

In addition, the boss (boss) of the housing provided for the fusion is damaged, there is a problem that the collector is separated.

Meanwhile, the stator tooth is coupled to the stator body by fusion bonding the protrusions disposed on the stator body. At this time, since there are a plurality of fusion joints, there are problems in that management is difficult and the manufacturing process is complicated.

An object of the embodiment is to provide a sensing device capable of avoiding magnetic field interference due to an external magnetic field generated outside during torque measurement.

In particular, an object of the embodiment is to provide a sensing device that prevents the collector from being deformed in the process of fixing the collector to the housing.

Another object of the embodiment is to provide a sensing device capable of constantly maintaining a gap between a collector and a collector or a height of the collector.

Another object of the embodiment is to provide a sensing device capable of facilitating dimensional management and simplifying the manufacturing process in coupling the stator tooth to the stator body.

The problems to be solved by the embodiment are not limited to the problems mentioned above, and other problems not mentioned here will be clearly understood by those skilled in the art from the following description.

An embodiment includes a stator including a stator tooth and a rotor including a magnet, wherein the stator tooth includes a first stator tooth and a second stator tooth disposed within the first stator tooth, the first stator tooth includes a plurality of first teeth, wherein the second stator teeth include a plurality of second teeth, wherein the first teeth overlap the second teeth in a radial direction at a center of the stator, and in the radial direction a first sensor and a collector disposed between the first stator tooth and the second stator tooth, wherein the collector includes a first collector and a second collector disposed within the first collector, wherein in the radial direction The first sensor is disposed between the ring-shaped first collector and the ring-shaped second collector, wherein the first collector and the second collector each have a body disposed to face the first sensor, and an extension extending from the body The sensing device may include a portion, wherein the extension portion includes a protrusion protruding from one edge of the extension portion in an axial direction, and the protrusion includes regions having different widths in a circumferential direction.

Preferably, it further includes a housing, wherein the housing may include a groove portion in which the protrusion is disposed.

Preferably, the protrusion includes a first protrusion protruding from the extension portion and a second protrusion extending from the first protrusion, and the circumferential width of the second protrusion may be greater than the circumferential width of the first protrusion. have.

Preferably, the groove portion may include a first groove in which the first projection is disposed, and a second groove extending from the first groove and in which the second projection is disposed.

Preferably, the housing may include a third protrusion, the third protrusion may be disposed to overlap the first and second collectors in an axial direction, and the groove portion may be disposed on the third protrusion. .

Preferably, one side of the extension portion in the axial direction may be in contact with the third protrusion.

Preferably, the housing may include a fourth protrusion, a portion of the protrusion may not be exposed in contact with the fourth protrusion, and the rest of the protrusion may be exposed.

Preferably, the third protrusion may be disposed between the first stator tooth and the second stator tooth in a radial direction.

Preferably, the housing may include a third protrusion protruding from the third protrusion, and the fifth protrusion may be disposed between the first collector and the second collector.

Preferably, an outer surface of the third protrusion may contact an inner surface of the extension of the first collector, and an inner surface of the third protrusion may contact an outer surface of the extension of the second collector.

An embodiment includes a stator and a rotor disposed within the stator, the stator comprising a stator holder, a stator body engaging the stator holder, and stator teeth disposed on the stator body, the stator body comprising an outer portion and the an inner portion disposed inside the outer portion, wherein the stator tooth comprises a first stator tooth and a second stator tooth disposed within the first stator tooth, the first stator tooth comprising a plurality of first teeth, , the second stator tooth includes a plurality of second teeth, the first tooth overlaps the second tooth and the center of the stator in a radial direction, and the first tooth is circumferential at the outer portion and the center of the stator direction, and the second tooth is disposed to overlap in the circumferential direction at the inner portion and the center of the stator, wherein the first tooth and the second tooth are disposed to be exposed in the stator body. Preferably, the first stator tooth includes a first body, the first tooth is disposed protruding from the first body, and the first body is disposed in a circumferential direction from the outer portion and the center of the stator. Doedoe overlapping, at least a portion of the first body may be disposed to be exposed from the stator body.

Preferably, the second stator tooth includes a second body, the second tooth is disposed to protrude from the second body, and the second body is disposed to overlap the inner portion and the center of the stator in a circumferential direction. However, at least a portion of the second body may provide a sensing device disposed to be exposed from the stator body.

Preferably, the first stator tooth includes a plurality of third teeth, and the third tooth is disposed to overlap the inner portion and the stator center in the circumferential direction, and the third tooth is exposed from the stator body. can be placed.

Preferably, the first stator tooth includes a first body from which the first tooth protrudes, an extension portion protruding inward from the first body, and a third tooth connected to the extension portion, the stator The body may include a partition wall connecting the outer portion and the inner portion, and the extension portion may be disposed to overlap the partition wall and the center of the stator in a circumferential direction, and the extension portion may be disposed to be exposed from the stator body.

An embodiment includes a stator and a rotor disposed within the stator, the stator comprising a stator holder, a stator body engaging the stator holder, and stator teeth disposed on the stator body, the stator body comprising an outer portion and the an inner portion disposed inside the outer portion, wherein the stator tooth comprises a first stator tooth and a second stator tooth disposed within the first stator tooth, the first stator tooth comprising a plurality of first teeth, , the second stator tooth includes a plurality of second teeth, the first tooth overlaps the second tooth and the center of the stator in a radial direction, and the outer portion and the inner portion each have a plurality of first sides Including, wherein the first side portion is disposed at intervals along the circumferential direction from the center of the stator, the first tooth and the second tooth are respectively disposed between the first side portion in the circumferential direction from the center of the stator to the first A sensing device in contact with one side may be provided.

Preferably, the stator body includes a plurality of second sides, the second sides are spaced apart from the center of the stator in a circumferential direction, the first stator teeth include a first body, and The first tooth may protrude from the first body, and the first body may contact the second side.

Preferably, the stator body may include a third side portion contacting the first body, and the third side portion may connect the plurality of second side portions.

Preferably, the first stator tooth includes a plurality of third teeth, and the third tooth is disposed between the first side portions in a circumferential direction from the center of the stator to be in contact with the first side portion.

Preferably, the first stator tooth includes a first body from which the first tooth protrudes, an extension portion protruding inward from the first body, and a third tooth connected to the extension portion, the stator The body may include a partition wall connecting the outer portion and the inner portion, the partition wall may include a plurality of walls, and the extension portion may be disposed between the walls in a circumferential direction from the center of the stator to be in contact with the wall.

Preferably, the outer portion includes a first contact surface of the stator body in contact with one side of the first tooth and a second contact surface of the stator body in contact with the other side of the first tooth, in the axial direction A region in which a circumferential width between the first contact surface and the second contact surface decreases toward the end of the first contact surface and the end of the second contact surface.

Preferably, the inner portion includes a third contact surface of the stator body in contact with one side of the second tooth and a fourth contact surface of the stator body in contact with the other side of the second tooth, in the axial direction An end of the third contact surface and a region in which a circumferential width between the third contact surface and the fourth contact surface decreases toward the end of the third contact surface.

Preferably, at least one of the first stator tooth and the second stator tooth may include a plurality of protrusions, and the protrusions may be disposed to overlap the stator body in a circumferential direction from the center of the stator.

In the sensing device according to the embodiment having the above configuration, a collector is disposed between a pair of stator teeth, and a sensor is disposed between the collectors, so that magnetic field interference caused by an external magnetic field generated outside during torque measurement is prevented. Or it can be minimized.

In addition, by arranging the first tooth of the first stator tooth and the second tooth of the second stator tooth disposed to be spaced apart from each other in the radial direction to overlap, and rotating the magnet between the first tooth and the second tooth, the The first tooth and the second tooth may be charged with different poles.

In addition, there is an advantage in that the size of the collected flux can be increased.

In addition, it is possible to prevent or minimize magnetic field interference due to an external magnetic field generated from the inside of the stator holder.

In addition, magnetic field interference caused by an external magnetic field introduced from the side of the sensing device may be prevented or minimized.

In addition, in the process of fixing the collector to the housing, deformation of the collector is prevented, thereby securing sensor performance. In particular, in the radial direction, the gap between the collector and the collector is kept unchanged and the height of the collector is kept constant in the axial direction to secure the performance of the sensing device.

In addition, there is an advantage that the collector can be prevented from being separated from the housing.

In addition, according to the embodiment, there is an advantage in that dimensional management is easy and the manufacturing process is simplified in coupling the stator tooth to the stator body.

In addition, according to the embodiment, there is an advantage of preventing the deformation of the stator due to the injection pressure in insert-injecting the stator tooth and the stator body.

Further, according to the embodiment, there is an advantage in that the stator tooth can be prevented from being axially separated from the stator body.

Various and advantageous advantages and effects of the embodiments are not limited to the above, and will be more easily understood in the course of describing specific embodiments of the embodiments.

1 is an exploded perspective view showing a sensing device according to an embodiment;

2 is a perspective view showing a stator of the sensing device according to the embodiment;

3 is a cross-sectional view showing a stator of the sensing device according to the embodiment;

4 is a plan view showing the stator body of the stator;

5 and 6 are cross-sectional views showing the stator body of the stator;

7 is a side view showing a first stator tooth;

8 is a side view showing a second stator tooth;

9 is a plan view showing a first stator tooth and a second stator tooth and a magnet;

10 is a view showing the first pole and the second pole of the magnet;

11 is a view showing a second angle;

12 is a view showing a third angle;

13 is a graph showing a first angle, a second angle and a third angle versus a plus (flux);

14 is a perspective view showing the arrangement of magnets with respect to the first stator tooth and the second stator tooth;

15 is a perspective view showing a first stator tooth;

16 is a perspective view showing a second stator tooth;

17 is a plan view of the first stator tooth;

18 is a plan view of a first stator tooth and a second stator tooth;

19 is a view showing a first tooth, a second tooth and a third tooth disposed on concentric circles;

20 is a plan view of the first stator tooth and the second stator tooth showing the flow of an external magnetic field introduced from the inside of the stator holder;

21 is a cross-sectional view of the first stator tooth showing the flow of an external magnetic field guided to the third tooth;

22 is a perspective view showing a first collector;

23 is a perspective view showing a second collector;

24 is a plan view of the first collector, the second collector, and the first sensor;

25 is a view showing an avoidance state of the stator tooth and the external magnetic field;

26 is a view showing a housing and a collector;

27 is a view showing the housing;

28 is an enlarged view of a groove portion disposed in the housing;

29 is a cross-sectional view of the housing and the collector based on G1-G1 of FIG. 26;

30 is a cross-sectional view of the housing and the collector based on G2-G2 of FIG. 26;

31 is a view showing a collector disposed in a housing according to a modified example;

32 is a view showing a housing according to a modification;

33 is an enlarged view of a groove portion disposed in the housing shown in FIG. 32;

34 is a cross-sectional view of the housing and the collector based on G3-G3 of FIG. 31;

35 is a cross-sectional view of the housing and the collector based on G4-G4 of FIG. 31;

36 is a view showing a first gear and a second gear meshing with the main gear;

37 is a view showing a stator of the sensing device according to the second embodiment;

38 is a perspective view showing a first collector;

39 is a perspective view showing a second collector;

40 is a view showing a stator;

41 is a cross-sectional view taken along line A-A;

42 is a cross-sectional view taken along line B-B;

43 is a perspective view showing the stator body;

44 is a plan view of the stator body;

45 is a view showing a first contact surface and a second contact surface of the outer portion of the stator body;

Figure 46 shows the third and fourth contact surfaces of the inner part of the stator body;

47 is a view showing the directionality of the external magnetic field with respect to the stator tooth;

48 is a diagram illustrating an avoidance state of the first sensor with respect to an external magnetic field having z-axis directionality;

49 is a graph comparing the comparative example and the example with respect to the amount of angular change corresponding to the external magnetic field in the z-axis direction;

50 is a graph comparing the comparative example and the embodiment with respect to the amount of angular change corresponding to the external magnetic field in the y'-axis direction.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical spirit of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the scope of the technical spirit of the present invention, one or more of the components may be selected among the embodiments. It can be combined and substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be generally understood by those of ordinary skill in the art to which the present invention pertains, unless specifically defined and described explicitly. It may be interpreted as a meaning, and generally used terms such as terms defined in advance may be interpreted in consideration of the contextual meaning of the related art.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In the present specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when it is described as "at least one (or one or more) of A and (and) B, C", it is combined with A, B, C It may include one or more of all possible combinations.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

These terms are only used to distinguish the component from other components, and are not limited to the essence, order, or order of the component by the term.

And, when it is described that a component is 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also with the component It may also include a case of 'connected', 'coupled' or 'connected' due to another element between the other elements.

In addition, when it is described as being formed or disposed on "above (above) or under (below)" of each component, the top (above) or bottom (below) is one as well as when two components are in direct contact with each other. Also includes a case in which another component as described above is formed or disposed between two components. In addition, when expressed as “upper (upper) or lower (lower)”, a meaning of not only an upper direction but also a lower direction based on one component may be included.

Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings, but the same or corresponding components are given the same reference numerals regardless of reference numerals, and overlapping descriptions thereof will be omitted.

1 is an exploded perspective view illustrating a sensing device according to an embodiment, and FIG. 2 is a perspective view illustrating a stator of the sensing device according to the embodiment. 1 and 2 , the z direction means an axial direction, and the y direction means a radial direction. And, the axial direction and the radial direction are perpendicular to each other.

1 and 2 , the sensing device according to the first embodiment includes a stator 100 , a rotor 200 partially disposed in the stator 100 , a first sensor 500 , and a first sensor 500 . and a circuit board 600 electrically connected to the housing 700 to which the circuit board 600 is coupled.

Here, the stator 100 is connected to the output shaft (not shown), and the rotor 200, at least a part of which is rotatably disposed in the stator 100, may be connected to the input shaft (not shown), but is not necessarily limited thereto.

In this case, the rotor 200 may be rotatably disposed with respect to the stator 100 . Hereinafter, the term "inside" means a direction arranged toward the center (C) with respect to the radial direction, and "outside" may mean a direction opposite to the inside.

3 is a cross-sectional view illustrating a stator of a sensing device according to an embodiment.

The stator 100 may be connected to an output shaft (not shown) of the steering shaft.

1 to 3 , the stator 100 may include a stator holder 110 , a stator body 120 , and a first stator tooth 130 and a second stator tooth 140 .

The stator holder 110 may be connected to an output shaft of the electric steering device. Accordingly, the stator holder 110 may rotate in association with the rotation of the output shaft. The stator holder 110 may be formed in a cylindrical shape. In addition, the stator holder 110 may be formed of a metal material, but is not necessarily limited thereto. For the stator holder 110 , other materials in consideration of strength above a certain level may be used so that the output shaft can be fitted and fixed. to be.

The stator holder 110 may include a groove 111 . The groove 111 is concavely formed on the outer circumferential surface of the stator holder 110 . The groove 111 is disposed along the outer circumferential surface of the stator holder 110 . A separate fixing member may be inserted into the groove 111 .

The stator holder 110 may be coupled to the stator body 120 .

The stator body 120 may be disposed at one end of the stator holder 110 . The stator body 120 may be coupled to the stator holder 110 by an insert injection method using a synthetic resin such as resin. A main gear 120a may be formed on an outer circumferential surface of the stator body 120 . The main gear 120a transmits the rotational force of the stator 100 to the first gear (10 in FIG. 36 ) and the second gear (20 in FIG. 36 ).

The first stator tooth 130 and the second stator tooth 140 may be disposed to be spaced apart from each other in the radial direction. In addition, the first stator tooth 130 and the second stator tooth 140 may be fixed to the stator body 120 . The first stator tooth 130 includes a first body 131 , a first tooth 132 , and a third tooth 133 . The second stator tooth 140 includes a second body 141 and a second tooth 142 .

4 is a plan view illustrating the stator body of the stator, and FIGS. 5 and 6 are cross-sectional views illustrating the stator body of the stator.

4 to 6 , the stator body 120 includes an inner portion 121 , an outer portion 122 , and a diaphragm 123 . The inner portion 121 and the outer portion 122 have a cylindrical shape. The outer portion 122 is disposed to be spaced apart from the outer side of the inner portion 121 in the radial direction. The diaphragm 123 connects the inner part 121 and the outer part 122 . The inner portion 121 , the outer portion 122 , and the diaphragm 123 may be integrally formed. The stator holder 110 may be coupled to the inner side of the inner portion 121 . A space S may be formed between the outer part 122 and the inner part 121 . The diaphragm 123 may be formed in a plate shape. The diaphragm 123 may be disposed between the inner portion 121 and the outer portion 122 .

The space S may be divided into a first space S1 and a second space S2 by the diaphragm 123 . The first sensor 500 may be disposed in the first space S1 , and the magnet 230 may be disposed in the second space S2 . The diaphragm 123 may be disposed below the virtual horizontal line L1 . here. The imaginary horizontal line L1 passes through the center of the outer part 122 in the axial direction.

Meanwhile, the diaphragm 123 may include a first hole 124 and a second hole 125 . The first hole 124 and the second hole 125 are for disposition of the first stator tooth 130 and the second stator tooth 140 .

A first body 131 and a second body 141 may be disposed in the first space S1 . A first tooth 132 and a second tooth 142 may be disposed in the second space S2 .

A plurality of first holes 124 may be formed to be spaced apart from each other in a circumferential direction. And, the first tooth 132 is disposed in the second space (S2) through the first hole (124). In this case, the number of the first holes 124 is the same as the number of the first teeth 132 . The first hole 124 may be disposed adjacent to an inner circumferential surface of the outer portion 122 . As shown in FIG. 8 , the first hole 124 may be formed in the partition plate 123 to abut against the inner peripheral surface of the outer part 122 .

A plurality of second holes 125 may be formed to be spaced apart from each other in the circumferential direction. In this case, the second hole 125 may be disposed to be spaced apart from the inside of the first hole 124 in the radial direction. And, the second tooth 142 is disposed in the second space (S2) through the second hole (125). In this case, the number of the second holes 125 is the same as the number of the second teeth 142 of the second stator teeth 140 . The second hole 125 may be disposed adjacent to the outer peripheral surface of the inner portion 121 . The second hole 125 may be formed in the diaphragm 123 to abut against the outer peripheral surface of the inner portion 121 .

A plurality of third holes 127 may be formed to be spaced apart from each other in the circumferential direction. The third hole 127 may be disposed between the second hole 125 and the second hole 125 in the circumferential direction. The third tooth 133 is disposed in the second space S2 through the third hole 127 . In this case, the number of the third holes 127 may be the same as the number of the third teeth 133 of the first stator tooth 130 . The third hole 127 may be disposed adjacent to the outer peripheral surface of the inner portion 121 . The third hole 127 may be formed in the diaphragm 123 to abut against the outer peripheral surface of the inner portion 121 .

The first stator tooth 130 and the second stator tooth 140 may be disposed between the outer circumferential surface of the inner portion 121 of the stator body 120 and the inner circumferential surface of the outer portion 122 . Here, the first stator tooth 130 and the second stator tooth 140 may be formed of a metal material for charging by rotation of the magnet 230 .

And, the first stator tooth 130 may be fixed to the inner circumferential surface of the outer part 122 by an adhesive member (not shown) such as a bond, and the second stator tooth 140 is an adhesive member such as a bond (not shown) may be fixed to the outer circumferential surface of the inner portion 121, but is not necessarily limited thereto. For example, each of the first stator tooth 130 and the second stator tooth 140 may be fixed to the stator body 120 through a fastening member (not shown) or a caulking method.

A boss 126 is extended to the lower side of the diaphragm 123 and is disposed. The side wall of the boss 126 and the outer portion 122 are spaced apart to form a first slot U1. The first tooth 132 is inserted into the first slot U1 and penetrates the first hole 124 to be positioned in the second space S2. And the side wall of the boss 126 and the inner side 121 are spaced apart to form a second slot (U2). The second tooth 142 and the third tooth 133 are inserted into the second slot U2 and pass through the second hole 125 and the third hole 127, respectively, and are positioned in the second space S2.

The first slot U1 guides the first tooth 132 to the first hole 124 while the first stator tooth 130 is coupled to the stator body 120 to facilitate coupling.

The second slot U2 connects the second tooth 142 and the third tooth 133 to the second hole 125 and the second hole, respectively, while the second stator tooth 130 is coupled to the stator body 120 . 3 guide to the hole 124, to facilitate the coupling.

7 is a side view showing the first stator tooth, and FIG. 8 is a side view showing the second stator tooth.

2 and 7 , the first stator tooth 130 may include a first body 131 and a plurality of first teeth 132 spaced apart from each other and protruding in the axial direction. can

2 and 8 , the second stator tooth 140 may include a second body 141 and a plurality of second teeth 142 spaced apart from each other and protruding in the axial direction. can

The height H1 of the first body 131 with respect to the upper surface 131a of the first body 131 is smaller than the height H2 of the first tooth 132 . In addition, the height H3 of the second body 141 with respect to the upper surface 141a of the second body 141 is smaller than the height H4 of the second tooth 142 . However, the present invention is not limited thereto, and the height H2 of the first tooth 132 may be different from the height H4 of the second tooth 142 .

9 is a plan view illustrating a first stator tooth, a second stator tooth, and a magnet.

Referring to FIG. 9 , the first stator tooth 130 is disposed outside the second stator tooth 140 . When viewed in the radial direction (y-direction), the first teeth 132 and the second teeth 142 may be disposed to overlap in the radial direction. Such an arrangement of the first tooth 132 and the second tooth 142 has an effect of reducing magnetic flux leakage.

10 is a view showing a first pole and a second pole of the magnet.

Referring to FIG. 10 , the magnet includes a first pole 230A and a second pole 230B. The first pole 230A and the second pole 230B may be alternately disposed along the circumferential direction of the magnet.

The first pole 230A and the second pole 230B may include an N-pole area NA and an S-pole area SA, respectively. The first pole 230A and the second pole 230B may have a multi-layer structure in which the N-pole area NA and the S-pole area SA are divided into inner and outer sides, respectively.

In the first pole 230A, the N-pole area NA may be disposed relatively outside, and the S-pole area SA may be disposed inside the N-pole area NA. In the second pole 230B, the N-pole area NA may be disposed relatively inside, and the S-pole area SA may be disposed outside the N-pole area NA.

The N-pole area NA of the first pole 230A and the S-pole area SA of the second pole 230B are disposed adjacent to each other. The S-pole area SA of the first pole 230A and the N-pole area NA of the second pole 230B are disposed adjacent to each other.

When the magnet 230 rotates and the first tooth 132 is charged to the S pole as the S pole area SA approaches, the second tooth 142 is charged to the N pole because the N pole area NA approaches. do. Alternatively, when the magnet 230 rotates and the first tooth 132 is charged to the N pole as the N pole area NA approaches, the second tooth 142 moves to the S pole because the S pole area SA approaches the S pole. to be charged Accordingly, the first sensor 500 may measure the angle through the magnetic field applied through the first stator tooth 130 , the second stator tooth 140 , and the collector ( 800 of FIG. 22 ).

In the sensing device according to the embodiment, the first tooth 132 and the second tooth 142 overlap in the radial direction. Both ends of the second tooth 142 may overlap the first tooth 132 . For example, in designing the position and size of the first tooth 132 and the second tooth 142, the first angle Θ1, the second angle Θ2 (FIG. 11), and the third angle (FIG. 12) Θ3) may be the same.

The first angle Θ1 represents an angle formed by both ends of the first pole 230A with respect to the stator center C. For example, when there are eight first poles 230A and eight second poles 230B, the first angle Θ1 may be 22.5°.

11 is a diagram illustrating a second angle Θ2, and FIG. 12 is a diagram illustrating a third angle Θ3.

Referring to FIG. 11 , the second angle Θ2 represents an angle formed by both ends P1 of the first tooth 132 with respect to the stator center C. In the axial direction, the reference point G defining both ends P1 of the first tooth 132 is as follows. The reference point G is the first tooth 132 corresponding to the middle point of the height H1 of the body 231 of the magnet 230 when the body 231 of the magnet 230 is disposed to face each other. Corresponds to the point of the tooth (132). The height H1 of the body 231 of the magnet 230 means a height formed by the upper surface 231a and the lower surface 231b of the magnet 230 in the axial direction. An angle Θ4 between the first tooth 132 and the first tooth 132 at the reference point G may be the same as the second angle Θ2.

Referring to FIG. 12 , the third angle Θ3 represents an angle formed by both ends P2 of the second tooth 142 with respect to the stator center C. In the axial direction, the reference point G defining both ends P2 of the second tooth 142 is as follows. The reference point G is a second tooth 142 corresponding to the middle point of the height H1 of the body 231 of the magnet 230 when the body 231 of the magnet 230 is disposed to face each other. Corresponds to the point of the tooth 142. An angle Θ5 between the second tooth 142 and the second tooth 142 at the reference point G may be the same as the third angle Θ3.

13 is a graph illustrating a first angle Θ1, a second angle Θ2, and a third angle Θ3 versus a plus (flux).

Referring to FIG. 13 , in a state in which the second angle Θ2 and the third angle Θ3 are set to be the same, as the second angle Θ2 and the third angle Θ3 are closer to the first angle Θ1 It can be seen that the magnitude of the flux increases, and the positive magnitude decreases as the second angle Θ2 and the third angle Θ3 move away from the first angle Θ1. When the sizes and positions of the first teeth 132 and the second teeth 142 are aligned so that the second angle Θ2 and the third angle Θ3 are equal to the first angle Θ1, the first, It can be seen that the magnitude of the flux of the 2 stator teeth 130 and 140 is the largest.

Referring to FIG. 1 , the rotor 200 may include a rotor holder 210 , a rotor body 220 , and a magnet 230 . The rotor holder 210 , the rotor body 220 , and the magnet 230 may be integrally formed.

The rotor holder 210 may be connected to an input shaft of the electric steering device. Accordingly, the rotor holder 210 may rotate in association with the rotation of the input shaft. The rotor holder 210 may be formed in a cylindrical shape. In addition, an end of the rotor holder 210 may be coupled to the rotor body 220 . The rotor holder 210 may be formed of a metal material, but is not necessarily limited thereto. Of course, other materials may be used for the rotor holder 210 in consideration of strength above a certain level so that the input shaft can be fitted and fixed.

The rotor body 220 is disposed on one side of the outer peripheral surface of the rotor holder 210 . The rotor body 220 may be an annular member.

The magnet 230 is coupled to the rotor body 220 . The magnet 230 rotates in conjunction with the rotor holder 210 when it rotates.

14 is a perspective view illustrating the arrangement of magnets with respect to the first stator tooth and the second stator tooth.

Referring to FIG. 14 , a magnet 230 is disposed between the first tooth 132 and the second tooth 142 . And. A magnet 230 is disposed between the third tooth 133 and the first tooth 132 .

The body 231 of the magnet 230 is disposed to face the first tooth 132 , the second tooth 142 , and the third tooth 133 . The protrusion 232 of the magnet 230 is disposed above the first tooth 132 , the second tooth 142 , and the third tooth 133 .

15 is a perspective view illustrating a first stator tooth.

Referring to FIG. 15 , the first stator tooth 130 may include a first body 131 , a first tooth 132 , a third tooth 133 , and an extension part 134 . The first body 131 may be a ring-shaped member. The first teeth 132 may be disposed to be spaced apart from each other in the circumferential direction, and may extend upward from the upper side of the first body 131 . The first body 131 and the plurality of first teeth 132 may be integrally formed. The extension 134 protrudes inward from the first body 131 . The third tooth 133 is connected to the extension 134 .

The first tooth 132 and the third tooth 133 may be formed in the shape of the lower light supremacy. For example, when viewed in the radial direction, the width of each of the lower side of the first tooth 132 and the third tooth 133 may be greater than the width of the upper side. The first tooth 132 and the third tooth 133 may be formed in a trapezoidal shape, respectively. And, as the first tooth 132 passes through the first hole 124 and the third tooth 133 passes through the third hole 127 , the upper surface of the first body 131 and the extension part 134 . ) may be in contact with the lower surface of the diaphragm 123 .

16 is a perspective view illustrating a second stator tooth.

Referring to FIG. 16 , the second stator tooth 140 may include a second body 141 and a second tooth 142 . The second teeth 142 may be disposed to be spaced apart from each other in the circumferential direction, and may extend upward from the upper side of the second tooth 142 . The second body 141 and the plurality of second teeth 142 may be integrally formed. The second tooth 142 may be formed in the shape of the lower light. For example, when viewed in the radial direction, the width of the lower side of the second tooth 142 may be greater than the width of the upper side. The second tooth 142 may have a trapezoidal shape.

The second body 141 may include a protrusion 141a. The protrusion 141a may be an annular member that is bent outwardly and protrudes with respect to the second tooth 142 . The protrusion 141a increases the amount of flux applied to the first sensor 500 by reducing the air gap between the first sensor 500 and the second body 141 .

17 is a plan view of the first stator tooth.

17, the shortest distance (R1) from the center (C) of the first stator tooth 130 to the first tooth 132 is the third tooth (C) from the center (C) of the first stator tooth 130 133) is greater than the shortest distance (R2). Relatively, the third tooth 133 is disposed closer to the center C of the first stator tooth 130 than the first tooth 132 . This is to guide the external magnetic field introduced from the inside of the stator holder 110 to the third tooth 133 .

18 is a plan view of a first stator tooth and a second stator tooth;

Referring to FIG. 18 , the diameter D3 formed by the plurality of third teeth 133 is smaller than the diameter D1 formed by the plurality of first teeth 132 , and the diameter D3 formed by the plurality of second teeth 132 is ( D2) is smaller than the diameter D1 formed by the plurality of first teeth 132 . Based on the magnet 230 , the first tooth 132 is disposed outside the magnet 230 , and the second tooth 142 and the third tooth 133 are disposed inside the magnet 230 .

19 is a view illustrating a first tooth, a second tooth, and a third tooth disposed on concentric circles.

Referring to FIG. 19 , the first tooth 132 , the second tooth 142 , and the third tooth 133 may be disposed on concentric circles. second tooth 142 . The third tooth 133 may be disposed on a first virtual circumference O1, and the first tooth 132 may be disposed on a second virtual circumference O2 different from the first virtual circumference O1. have. second tooth 142 . The third teeth 133 may be alternately disposed along the circumferential direction of the stator 100 . The first circumference O1 is disposed inside the second circumference O2. This is to disperse the external magnetic field introduced from the inside of the stator holder 110 in all directions through the second teeth 142 and the third teeth 133 .

Meanwhile, the circumferential width t3 of the lower end of the third tooth 133 may be smaller than the circumferential width t1 of the lower end of the first tooth 132 . In addition, the circumferential width t3 of the lower end of the third tooth 133 may be smaller than the circumferential width t2 of the lower end of the second tooth 142 .

20 is a plan view of the first stator tooth and the second stator tooth showing the flow of the external magnetic field flowing from the inside of the stator holder, and FIG. 21 is the first stator tooth showing the flow of the external magnetic field guided to the third tooth. is a cross section of

Referring to FIG. 20 , the external magnetic fields W1 and W2 introduced along the stator holder 110 are directed toward the first stator tooth 130 and the second stator tooth 140 with respect to the radial direction of the stator 100 . is brought in These external magnetic fields W1 and W2 are distributed and guided to the third tooth 133 together with the second tooth 142 .

Referring to FIG. 21 , the external magnetic field M1 introduced into the third tooth 133 is guided to the extension part 134 . In this case, the external magnetic field M1 introduced into the third tooth 133 may be offset from the external magnetic field M2 introduced from the magnet 230 into the first tooth 132 and guided to the extension part 134 . As such, since the external magnetic field introduced along the stator holder 110 is guided to the first stator tooth 130 and canceled, there is an advantage that can greatly reduce the influence of the external magnetic field on the first sensor 500 .

<Table 1> below compares the torques of Comparative Examples and Examples.

	Comparative Example Torque (Nm)	Example torque (Nm)
radial external magnetic field 1000A/m	0.41 Nm	0.05 Nm

A comparative example is a sensing device having no structure such as the third tooth 133 . The embodiment is a sensing device including the third tooth 133 . In the absence of an external magnetic field in the radial direction, the torque ONm is normal. When an external magnetic field (1000 A/m) is applied in the radial direction to Comparative Examples and Examples, in the case of Comparative Examples, a torque of 0.41 Nm is measured, and it can be seen that the external magnetic field is greatly affected. However, in the case of the embodiment, it can be seen that the measured torque is 0.05 Nm, which is hardly affected by the external magnetic field.

but. In the radial direction, the gap between the first and second stator teeth 130 and 140 and the first sensor 500 determines the amount of flux. When the gap between the first and second stator teeth 130 and 140 and the first sensor 500 is decreased, the flux passing through the first sensor 500 is increased to increase the sensitivity of the measured magnetic flux. Conversely, when the gap between the first and second stator teeth 130 and 140 and the first sensor 500 is reduced, the flux passing through the first sensor 500 is reduced, thereby reducing the sensitivity of the measured magnetic flux. Because. A wobble value may greatly increase according to a deviation of a gap between the first and second stator teeth 130 and 140 and the first sensor 500 .

22 is a perspective view of a first collector, FIG. 23 is a perspective view of a second collector, and FIG. 24 is a plan view of the first collector, the second collector, and the first sensor.

22 to 24 , the collector 800 may include a first collector 810 and a second collector 820 . The first collector 810 and the second collector 820 collect the flux of the stator 100, respectively. In addition, the first collector 810 and the second collector 820 may be formed of a metal material. The first collector 810 and the second collector 820 are disposed to be spaced apart from each other in the radial direction with the stator center C coaxially.

In a radial direction from the stator center C, the second collector 820 may be disposed inside the first collector 810 . Each of the first collector 810 and the second collector 820 may be a ring-shaped member. Since the first collector 810 and the second collector 820 are ring-shaped members, respectively, the collector 800 may cover the entire area of the first and second stator teeth 130 and 140 in the circumferential direction. As a result, when the entire area of the first and second stator teeth 130 and 140 is considered, the sensitivity of the measured magnetic flux according to the deviation of the gap between the first and second stator teeth 130 and 140 and the first sensor 500 is complementary and stable. There is an advantage in that the wobble value is improved.

The first collector 810 and the second collector 820 may include extension portions 811 and 821 , first bodies 812 and 822 , and second bodies 813 and 823 , respectively. The first bodies 812 and 822 and the second bodies 813 and 823 are disposed to face the first sensor 500 , respectively. The second bodies 813 and 823 may extend from the first bodies 812 and 822 . The extension parts 811 and 821 may extend from the first bodies 812 and 822 and the second bodies 813 and 823, respectively. The first body (812, 822) and the second body (813, 823) may each include a flat surface. The extension parts 811 and 821 may include curved surfaces. The extensions 811 and 821 may include protrusions 814 and 824 . The protrusions 814 and 824 protrude from one edge of the extensions 811 and 821 . The protrusions 814 and 824 are for coupling the housing 700 and the collector 800 .

The protrusions 814 and 824 may be plural. Each of the protrusions 814 and 824 may include regions of different circumferential widths. For example, the protrusions 814 and 824 may include first protrusions 814a and 824a and second protrusions 814b and 824b. The first protrusions 814a and 824a protrude from the extensions 811 and 821 . The second protrusions 814b and 824b protrude from the first protrusions 814a and 824a. The circumferential widths K2 and K4 of the second protrusions 814b and 824b may be greater than the circumferential widths K1 and K3 of the first protrusions 814a and 824a. The shape of the protrusions 814 and 824 is to prevent the protrusions 814 and 824 from being separated from the housing 700 in the axial direction.

The first sensor 500 detects a change in a magnetic field generated between the stator 100 and the rotor 200 . The first sensor 500 may be a Hall IC. The first sensor 500 detects the amount of magnetization of the stator 100 generated by the electrical interaction between the magnet 230 of the rotor 200 and the stator 100 . Based on the detected amount of magnetization, the sensing device measures the torque.

25 is a diagram illustrating the avoidance state of the stator teeth 130 and 140 and the external magnetic field.

Referring to FIG. 25 , the first collector 810 serves as a shield against an external magnetic field directed toward the first sensor 500 together with the first stator tooth 130 .

The external magnetic field greatly affects the sensing device in the y'-axis direction. Here, the y'-axis direction refers to a direction toward the first sensor 500 in a radial direction perpendicular to the axial direction. Since the external magnetic field in the y'-axis direction is induced along the first stator tooth 130 and the second stator tooth 140 as shown in S1 of FIG. 25 , it flows without affecting the first sensor 500 . Therefore, the sensing device according to the embodiment has an advantage that the influence of the external magnetic field on the first sensor 500 is small even with reference to the y'-axis direction.

In addition, since the external magnetic field passing through the first stator tooth 130 toward the first sensor 500 may be induced by the first collector 810 as shown in S2 of FIG. 25 , the inside of the first collector 810 . It flows without affecting the first sensor 500 disposed in the. Therefore, the sensing device according to the embodiment has an advantage that the influence of the external magnetic field on the first sensor 500 is small even with reference to the y'-axis direction.

FIG. 26 is a view showing the housing 700 and the collector 800 , and FIG. 27 is a view showing the housing 700 .

26 and 27 , the collector 800 is mounted on the housing 700 .

The housing 700 has a plate shape including an upper surface and a lower surface, and may have an open upper and lower portion. A hole 701 is disposed at the center of the housing 700 . The stator holder 110 is positioned inside the hole 701 . A circuit board 600 may be mounted on a lower surface of the housing 700 . The first sensor 500 is mounted on the circuit board 600 . The first sensor 500 may be disposed on the upper surface of the housing 700 through the hole 740 of the housing 700 . A separate cover may be coupled to the lower side of the housing 700 to cover the circuit board 600 .

The housing 700 may include a groove portion 710 , a third protrusion 720 , and a fourth protrusion 730 .

The third protrusion 720 may protrude from the upper surface of the housing 700 in the axial direction. The third protrusion 720 may be disposed along the circumference of the hole 701 . The third protrusion 720 may be an arc-shaped member. A portion of the third protrusion 720 may be disposed between the first collector 810 and the second collector 820 in the radial direction. The entire third protrusion 720 may be disposed between the first stator tooth 130 and the second stator tooth 140 in the radial direction. An upper surface of the third protrusion 720 may contact a lower surface of the first collector 810 and a lower surface of the second collector 820 .

The fourth protrusion 730 may protrude from the upper surface of the housing 700 in the axial direction. The fourth protrusion 730 may be disposed inside and outside the third protrusion 720 , respectively.

The groove portion 710 is concavely disposed in the third protrusion 720 . The groove portion 710 may be concavely formed on the upper surface and the inner circumferential surface of the third protrusion 720, or may be concavely formed on the upper surface and the outer circumferential surface of the third protrusion 720. This groove portion 710 is the protrusion ( 814,824) is inserted. The groove portion 710 may include a first groove 711 and a second groove 712 . The first groove 711 is where the first protrusions 814a and 824a of the protrusions 814 and 824 are disposed, and the second groove 712 is where the second protrusions 814b and 824b of the protrusions 814 and 824 are disposed. to be. When the protrusions 814 and 824 are disposed in the groove portion 710 , the collector 800 is disengaged from the housing 700 in the axial direction because the second projections 814b and 824b axially engage the first groove 711 . is prevented from becoming

28 is an enlarged view of the groove portion 710 disposed in the housing 700 .

27 and 28 , the groove portion 710 in which the protrusion 814 of the first collector 800 is disposed and the groove portion 710 in which the protrusion 824 of the second collector 800 is disposed are disposed to correspond to each other. can be The groove portion 710 in which the protrusion 814 of the first collector 800 is disposed may be disposed adjacent to the outer circumferential surface of the third protrusion 720 . The groove portion 710 in which the protrusion 824 of the second collector 800 is disposed may be disposed adjacent to the inner circumferential surface of the third protrusion 720 .

Adjacent to the groove portion 710 , a fourth protrusion 730 is disposed inside and outside the third protrusion 720 , respectively.

29 is a cross-sectional view of the housing 700 and the collector 800 taken along G1-G1 of FIG. 26 , and FIG. 30 is a cross-sectional view of the housing 700 and the collector 800 taken along G2-G2 of FIG. 26 . to be.

26 and 29 , the first collector 810 and the second collector 820 are seated on the third protrusion 720 , respectively. The third protrusion 720 is disposed to overlap the first collector 810 and the second collector 820 in the axial direction. Accordingly, one side edge of the extended part 811 of the first collector 810 and one side of the extended part 821 of the second collector 820 come into contact with the upper surface of the third protrusion 720 .

Referring to FIGS. 26 and 30 , as shown in FIG. 29 , in a state in which the first collector 810 and the second collector 820 are seated on the third protrusion 720 , respectively, the protrusions 814 and 824 are grooves. It is placed at 710 . A portion of the protrusions 814 and 824 may not be exposed in contact with the fourth protrusion 730 , and the remaining portions F of the protrusions 814 and 824 may be exposed to the outside. The fourth protrusion 730 radially supports a portion of the protrusions 814 and 824 .

FIG. 31 is a view showing the collector 800 disposed in the housing 700 according to the modified example, FIG. 32 is a view showing the housing 700 according to the modified example, and FIG. 33 is the housing shown in FIG. 32 . It is an enlarged view of the groove portion 710 disposed at 700 .

The housing 700 according to the modified example may additionally include a fifth protrusion 750 .

The fifth protrusion 750 may protrude from the upper surface of the third protrusion 720 in the axial direction. The fifth protrusion 750 may be an arc-shaped member. The fifth protrusion 750 may be disposed between the first collector 810 and the second collector 820 in the radial direction.

The groove portion 710 of the housing 700 according to the modified example may be concavely disposed on the upper surface of the third protrusion 720 . The groove 710 in which the protrusion 814 of the first collector 810 is disposed is disposed outside the fifth protrusion 750, and the groove 710 in which the protrusion 824 of the second collector 820 is disposed is It may be disposed inside the fifth protrusion 750 .

FIG. 34 is a cross-sectional view of the housing and the collector 800 based on G3-G3 of FIG. 31 , and FIG. 35 is a cross-sectional view of the housing and the collector 800 with reference to G4-G4 of FIG. 31 .

31 and 34, in a state in which the first collector 810 and the second collector 820 are seated on the third protrusion 720, respectively, the fifth protrusion 750 is radially connected to the first collector ( It is disposed between the 810 and the second collector 820 . The outer circumferential surface of the fifth protrusion 750 is in contact with the inner circumferential surface of the first collector 810 , and the inner circumferential surface of the fifth protrusion 750 is in contact with the outer circumferential surface of the second collector 820 , so that the first collector 810 and the The gap between the two collectors 820 is physically maintained.

31 and 35 , when the protrusions 814 and 824 are disposed in the groove 710 , the protrusions 814 and 824 may be located inside the third protrusion 720 without being exposed to the outside. Since the third protrusion 720 completely covers the protrusions 814 and 824 , the collector 800 may be more firmly fixed to the housing.

Such a relative structure of the housing 700 and the collector 800 may be a structure that can be implemented while the housing 700 and the collector 800 are insert-injected and integrally molded. Since the housing 700 and the collector 800 are integrally formed, there is an advantage that a fusion structure or a fusion process for fixing the collector 800 to the housing 700 is unnecessary. In particular, since there is no risk of the fusion part being damaged, the fatal problem of the collector 800 being separated from the housing 700 can be fundamentally eliminated.

36 is a view showing the first gear and the second gear meshing with the main gear.

Referring to FIG. 36 , as a sub gear meshing with the main gear 120a, the first gear 1000 and the second gear 1100 are included. The main gear 120a, the first gear 10, the second gear 20, and the second sensor 610 are for measuring the angle of the steering shaft.

The main gear 120a, the first gear 10, and the second gear 20 mesh with each other and rotate. The main gear 120a is disposed on the outer peripheral surface of the stator body 120 . The first gear 10 and the second gear 20 are rotatably disposed in the housing 700 . The main gear 120a, the first gear 10, and the second gear 20 each have a predetermined gear ratio. For example, if the total angle of the main gear 120a is , when the main gear 120a rotates 4.5 rotations, the first gear 10 rotates 15.6 rotations, and the second gear 20 rotates 14.625 rotations. can Here, the total angle is an angle calculated by accumulating rotation of the main gear 120a when all gears return to the state immediately before rotation.

A magnet may be disposed on the first gear 10 and the second gear 20 . The magnet is disposed to face the second sensor 610 .

37 is a diagram illustrating a stator of a sensing device according to a second embodiment.

Referring to FIG. 37 , the stator 1000 of the sensing device according to the second embodiment includes a stator holder 1110 , a stator body 1120 , a first stator tooth 1130 , and a second stator tooth 1140 . may include Hereinafter, only a configuration different from that of the sensing device according to the first embodiment will be described, and a description of the same configuration will be omitted.

The first stator tooth 1130 and the second stator tooth 1140 may be disposed to be spaced apart from each other in the radial direction. In addition, the first stator tooth 1130 and the second stator tooth 1140 may be fixed to the stator body 1120 . The first stator tooth 1130 includes a first body 1131 , a first tooth 1132 , a third tooth 1133 , and an extension part 1134 . The second stator tooth 1140 includes a second body 1141 and a second tooth 1142 .

The stator holder 1110 may be coupled to the stator body 1120 .

A plurality of protrusions 1135 may be disposed on the first body 1131 . The protrusion 1135 may protrude outward from the first body 1131 . The protrusion 1135 is disposed to overlap the stator body 1120 in the circumferential direction from the center of the stator 1000 . The protrusion 1135 may increase a bonding force by increasing a contact area with the stator body 1120 , and may prevent slippage between the stator body 1120 and the first body 1131 .

38 is a perspective view illustrating a first collector, and FIG. 39 is a perspective view illustrating a second collector.

38 and 39 , the collector 1800 may include a first collector 1810 and a second collector 1820 . The first collector 1810 and the second collector 1820 collect the flux of the stator 1000, respectively. In addition, the first collector 1810 and the second collector 1820 may be formed of a metal material. The first collector 1810 and the second collector 1820 are disposed to be spaced apart from each other in a radial direction with the center C of the stator 1000 coaxial. Each of the first collector 1810 and the second collector 1820 may be a ring-shaped member.

40 is a view showing the stator 1000, FIG. 41 is a cross-sectional view taken along line A-A, and FIG. 42 is a cross-sectional view taken along line B-B.

40 to 42 , the stator body 1120 may include an inner portion 1121 , an outer portion 1122 , and a diaphragm 1123 . The inner portion 1121 and the outer portion 1122 have a cylindrical shape. The outer portion 1122 is disposed to be spaced apart from the outer side of the inner portion 1121 with respect to the radial direction. The diaphragm 1123 connects the inner part 1121 and the outer part 1122 . The inner portion 1121 , the outer portion 1122 , and the diaphragm 1123 may be integrally formed. A stator holder 1110 may be coupled to the inner side of the inner portion 1121 . A space S may be formed between the outer portion 1122 and the inner portion 1121 . The diaphragm 1123 may be formed in a plate shape. The diaphragm 1123 may be disposed between the inner portion 1121 and the outer portion 1122 .

The space S may be divided into a first space S1 and a second space S2 by the diaphragm 1123 . The first sensor 1500 may be disposed in the first space S1 , and the magnet 1230 may be disposed in the second space S2 . The diaphragm 1123 may be disposed below a virtual horizontal line. here. An imaginary horizontal line passes through the center of the outer part 1122 in the axial direction.

A first body 1131 and a second body 1141 may be disposed in the first space S1 . A first tooth 1132 and a second tooth 1142 may be disposed in the second space S2 .

The first stator tooth 1130 and the second stator tooth 1140 may be disposed between the outer circumferential surface of the inner portion 1121 of the stator body 1120 and the inner circumferential surface of the outer portion 1122 . Here, the first stator tooth 1130 and the second stator tooth 1140 may be formed of a metal material for charging by rotation of the magnet 1230 .

The first tooth 1132 and the second tooth 1142 may be disposed to be exposed from the stator body 1120 . For example, the first tooth 1132 may be disposed to be exposed from the outer part 1122 . In addition, the first tooth 1132 may be disposed to form an overlap region O1 in the circumferential direction from the center of the outer portion 1122 and the stator 1000 . The second tooth 1142 may be disposed to be exposed from the inner side. In addition, the second tooth 1142 may be arranged to form an overlap region O2 in the circumferential direction from the center of the inner portion 1121 and the stator 1000 .

The third tooth 1133 may also be disposed to be exposed from the stator body 1120 . For example, the third tooth 1133 may be disposed to be exposed from the inner side 1121 . In addition, the third tooth 1133 may be disposed to form an overlap region O3 in the circumferential direction from the center of the inner portion 1121 and the stator 1000 . The third tooth 1133 may be disposed to be exposed from the inner side 1121 .

The extension 1134 may be disposed to be exposed from the stator body 1120 . For example, the extension part 1134 may be disposed to be exposed from the inner part 1121 . In addition, the extension part 1134 may be disposed to overlap the partition wall 123 and the stator 1000 in the circumferential direction. The extension part 1134 may be disposed to be exposed from the partition wall 1123 .

In this coupling structure of the stator body 1120 and the stator 1000 teeth 1130 and 1140, the first stator tooth 1130, the second stator tooth 1140, and the stator body 1120 are insert-injected and integrally molded. and can be implemented. As described above, the first tooth 1132 , the second tooth 1142 , the third tooth 1133 , and the extension part 1134 are disposed to be exposed from the stator body 1120 and are empty in the stator body 1120 . In order to secure the space, the first tooth 1132 , the second tooth 1142 , the third tooth 1133 and the extension part 1134 are for facing the magnet and reduce the injection pressure in the insert injection process, This is to reduce deformation of the teeth 1130 and 1140 of the stator 1000 during the injection process.

43 is a perspective view illustrating the stator body 1120 , and FIG. 44 is a plan view of the stator body 1120 .

Referring to FIG. 43 , the outer portion 1122 and the inner portion 1121 of the stator body 1120 may include a plurality of first side portions K1 , respectively. The first side part K1 may be divided into a 1-1 side part K11 and a 1-2 th side part K12. The 1-1 side portion K11 is a member constituting the outer portion 1122 , and the first-second side portion K12 is a member forming the inner portion 1121 .

The plurality of 1-1 side portions K11 are disposed at intervals along the circumferential direction in the center of the stator 1000 to form a space A1 between adjacent 1-1 side portions K11. A first tooth 1132 may be disposed in this space A1 . The 1-1 side portion K11 is in contact with the side surface of the first tooth 1132 .

The plurality of 1-2 side portions K12 are disposed at intervals along the circumferential direction in the center of the stator 1000 to form spaces A2 and A3 between the adjacent 1-2 side portions K12 . A second tooth 1142 and a third tooth 1133 may be disposed in the spaces A2 and A3. The 1-2 second side portion K12 is in contact with the side surface of the second tooth 1142 . In addition, the 1-2 first side portion K12 may contact the side surface of the third tooth 1133 .

Meanwhile, the stator body 1120 may include a plurality of second side portions K2 . The second side portion K2 is in contact with the first body 1131 . For example, an inner surface of the second side portion K2 may contact an outer peripheral surface of the first body 1131 . The plurality of second side portions K2 are disposed at intervals along the circumferential direction at the center of the stator 1000 to form a space A4 between the adjacent second side portions K2. A part of the first body 1131 is exposed to the outside in this space A4. This space A4 plays a large role in reducing the injection pressure during the insert injection process of the first stator tooth 1130 , the second stator tooth 1140 , and the stator body 1120 .

The stator body 1120 may include a third side portion K3 connecting the plurality of second side portions K2 . The third side portion K3 may contact the outer peripheral surface of the first body 1131 .

Referring to FIG. 44 , the partition wall 1123 of the stator body 1120 may include a plurality of walls X1 . A plurality of walls X1 are arranged at intervals along the circumferential direction at the center of the stator 1000, and an extension 1134 is disposed between the adjacent walls X1 so that the extension 1134 is formed with the wall X1 and the wall X1. contact

45 is a view illustrating the first contact surface N1 and the second contact surface N2 of the outer portion 1122 of the stator body 1120 .

Referring to Figure 45. The outer portion 1122 of the stator body 1120 may include a first contact surface N1 and a second contact surface N2 . The first contact surface N1 is a surface of the outer portion 1122 in contact with one side of the first tooth 1132 . The second contact surface N2 is the other surface of the outer portion 1122 in contact with the other side surface of the first tooth 1132 . Each of the first contact surface N1 and the second contact surface N2 is an inclined surface. It is formed such that the circumferential width Q1 between the first contact surface N1 and the second contact surface N2 decreases toward the end of the first contact surface N1 and the second contact surface N2 in the axial direction. This corresponds to the tapered tip shape of the first tooth 1132 .

46 is a view illustrating the third contact surface N3 and the fourth contact surface N4 of the inner portion 1121 of the stator body 1120 .

Referring to Figure 46. The inner side 1121 of the stator body 1120 may include a third contact surface N3 and a fourth contact surface N4 . The third contact surface N3 is a surface of the inner portion 1121 in contact with one side of the third tooth 1133 . The fourth contact surface N4 is the other surface of the inner portion 1121 in contact with the other side surface of the second tooth 1142 . The third contact surface N3 and the fourth contact surface N4 are inclined surfaces, respectively. It is formed such that the circumferential width Q2 between the third contact surface N3 and the fourth contact surface N4 decreases toward the end of the third contact surface N3 and the fourth contact surface N4 in the axial direction. This corresponds to the tapered shape of the second tooth 1142 .

The first contact surface N1, the second contact surface N2, the third contact surface N3, and the fourth contact surface N4 prevent the stator teeth 1130 and 1140 from being separated from the stator body 1120 in the axial direction. plays a role

The coupling structure of the stator body 1120 and the stator teeth 1130 and 1140 also includes the first stator tooth 1130, the second stator tooth 1140, and the stator body 1120 are insert-injected and integrally molded to be implemented. it can be As described above, the first side part K1, the second side part K2, the third side part K3, and the wall secure the space A1 in the stator body 1120, respectively, to increase the injection pressure during the insert injection process. In short, it is intended to reduce the deformation of the stator teeth 1130 and 1140 during the insert injection process.

Since the positions of the first tooth 1132 , the second tooth 1142 , and the third tooth 1133 are very important factors for the performance of the sensor device, dimensional management affecting the positions of the stator teeth 1130 and 1140 is very important. It has to be done with precision. As described above, when the stator teeth 1130 and 1140 are coupled to the stator body 1120 through injection, there is an advantage in that it is very easy to manage dimensions based on the stator teeth 1130 and 1140 .

In addition, since there is no need for a separate fusion structure or fusion process for coupling the stator teeth 1130 and 1140 to the stator body 1120, the flow or separation of the stator teeth 1130 and 1140 due to damage to the fusion structure is fundamentally prevented. There is an advantage that has been removed, the manufacturing process is simplified, and there is an advantage that a facility for welding is not required.

47 is a view showing the directionality of the external magnetic field with respect to the stator teeth 130 and 140, and FIG. 48 is a view showing the avoidance state of the first sensor 500 with respect to the external magnetic field having the z-axis directionality.

Referring to FIG. 47 , the external magnetic field greatly affects the sensing device in the y'-axis direction, which is perpendicular to the z-axis direction, which is the axial direction.

Referring to FIG. 48 , the first sensor 500 of the sensing device according to the embodiment is disposed in an upright state in the z-axis direction. Therefore, the area of the first sensor 500 viewed from the z-axis is . It is much smaller than the area of the first sensor 500 viewed from y'. Accordingly, the sensing device according to the embodiment has an advantage in that the influence of the external magnetic field on the first sensor 500 in the z-axis direction is small.

Referring to FIGS. 25 and 47 , the outer peripheral magnetic field in the y'-axis direction may have a large effect on the first sensor 500 when the state of the first sensor 500 is erected in the z-axis direction. However, since the outer peripheral magnetic field in the y'-axis direction is induced along the first stator tooth 130 and the second stator tooth 140 , it flows without affecting the first sensor 500 . Therefore, the sensing device according to the embodiment has an advantage in that the influence of the external magnetic field on the first sensor 500 is small even when the y'-axis direction is referenced.

49 is a graph comparing the comparative example and the example with respect to the amount of angular change corresponding to the external magnetic field in the z-axis direction.

Referring to FIG. 49 , in the case of the comparative example, the stator teeth 130 and 140 are vertically disposed and the first sensor 500 is disposed to be lying down. As the external magnetic field in the z-axis direction increases, the amount of angular change is linear. It can be seen that the measurement angle changes significantly depending on the external magnetic field.

On the other hand, in the case of the embodiment, it can be seen that even when the external magnetic field in the z-axis direction increases, there is little change in the angle, so that the external magnetic field is not affected.

50 is a graph comparing the comparative example and the embodiment with respect to the amount of angular change corresponding to the external magnetic field in the y'-axis direction.

Referring to FIG. 50 , in the case of the comparative example, the first and second stator teeth 130 and 140 are vertically disposed, and the first sensor 500 is a sensing device of a structure in which the external magnetic field in the y'-axis direction is increased. It can be seen that the angle change increases linearly as the angle increases, and the measurement angle changes greatly depending on the external magnetic field.

On the other hand, in the case of the embodiment, it can be seen that even when the external magnetic field in the y'-axis direction increases, there is little change in the angle, so that the external magnetic field is not affected.

The present invention can be applied to various devices such as vehicles or home appliances.

Claims (10)

1. a stator comprising a stator tooth; and

   It includes a rotor comprising a magnet,

   The stator tooth includes a first stator tooth and a second stator tooth disposed within the first stator tooth,

   The first stator tooth includes a plurality of first teeth,

   The second stator tooth includes a plurality of second teeth,

   The first tooth overlaps with the second tooth in a radial direction at the center of the stator,

   a first sensor and a collector disposed between the first stator tooth and the second stator tooth in the radial direction;

   The collector includes a first collector and a second collector disposed within the first collector,

   In the radial direction, the first sensor is disposed between the ring-shaped first collector and the ring-shaped second collector,

   The first collector and the second collector each include a body disposed to face the first sensor, and an extension portion extending from the body,

   The extension includes a protrusion protruding from one edge of the extension in the axial direction,

   The protrusion includes regions having different widths in a circumferential direction.
2. According to claim 1,

   further comprising a housing,

   The housing includes a groove in which the protrusion is disposed.
3. According to claim 1,

   The protrusion includes a first protrusion protruding from the extension portion and a second protrusion extending from the first protrusion,

   A circumferential width of the second protrusion is greater than a circumferential width of the first protrusion.
4. 3. The method of claim 2,

   The groove portion includes a first groove in which the first protrusion is disposed, and a second groove extending from the first groove and in which the second protrusion is disposed.
5. 3. The method of claim 2,

   The housing includes a third protrusion, wherein the third protrusion is disposed to overlap the first collector and the second collector in an axial direction,

   The groove portion is a sensing device disposed on the third protrusion.
6. stator; and

   a rotor disposed within the stator;

   The stator includes a stator holder, a stator body coupled to the stator holder, and a stator tooth disposed on the stator body,

   The stator body includes an outer portion and an inner portion disposed inside the outer portion,

   The stator tooth includes a first stator tooth and a second stator tooth disposed within the first stator tooth,

   The first stator tooth includes a plurality of first teeth,

   The second stator tooth includes a plurality of second teeth,

   The first tooth overlaps with the second tooth in a radial direction at the center of the stator,

   The first tooth is disposed to overlap in the circumferential direction at the outer portion and the center of the stator, and the second tooth is disposed to overlap in the circumferential direction at the inner portion and the center of the stator,

   The first tooth and the second tooth are disposed to be exposed from the stator body.
7. 7. The method of claim 6,

   The first stator tooth includes a first body,

   The first tooth is disposed protruding from the first body,

   The first body is disposed to overlap in the circumferential direction at the center of the stator and the outer portion,

   At least a portion of the first body is disposed to be exposed from the stator body.
8. 7. The method of claim 6,

   The second stator tooth includes a second body,

   The second tooth is disposed to protrude from the second body,

   The second body is disposed to overlap in the circumferential direction at the center of the stator and the inner portion,

   At least a portion of the second body is disposed to be exposed from the stator body.
9. stator; and

   a rotor disposed within the stator;

   The stator includes a stator holder, a stator body coupled to the stator holder, and a stator tooth disposed on the stator body,

   The stator body includes an outer portion and an inner portion disposed inside the outer portion,

   The stator tooth includes a first stator tooth and a second stator tooth disposed within the first stator tooth,

   The first stator tooth includes a plurality of first teeth,

   The second stator tooth includes a plurality of second teeth,

   The first tooth overlaps with the second tooth in a radial direction at the center of the stator,

   The outer portion and the inner portion each include a plurality of first side portions,

   The first side portions are disposed at intervals along the circumferential direction from the center of the stator,

   The first tooth and the second tooth are respectively disposed between the first side portion in a circumferential direction from the center of the stator to contact the first side portion.
10. 10. The method of claim 9,

    the stator body comprises a plurality of second sides;

    The second side is disposed at intervals along the circumferential direction from the center of the stator,

    The first stator tooth includes a first body,

    The first tooth is disposed protruding from the first body,

    The first body is a sensing device in contact with the second side.

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